Aluminiumträger für lithographische Druckplatten

摘要

An aluminum support for a lithographic printing plate used in off-set printing or the like is disclosed, having a surface shape determined using an atomic force microscope (AFM) such that when measured within the measurement range of 100 mu m square with the resolution in the horizontal (X, Y) direction being 0.1 mu m, assuming that the surface area obtained by an approximate three-point problem is alpha and the upper projected area is beta , the alpha / beta value (specific surface area) is from 1.15 to 1.5, and when measured within the measurement range of 240 mu m square with the resolution in the horizontal (X, Y) direction being 1.9 mu m, the average surface roughness is from 0.35 to 1.0 mu m and the ratio of the sum of the surface area where the gradient of 30 DEG or more to the total surface area is from 5 to 40%.